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2.5.3. Disabling ACPI Completely in the grub.conf File

The preferred method of disabling ACPI Soft-Off is with chkconfig management (Section 2.5.1, “Disabling ACPI Soft-Off with chkconfig Management”). If the preferred method is not effective for your cluster, you can disable ACPI Soft-Off with the BIOS power management (Section 2.5.2, “Disabling ACPI Soft-Off with the BIOS”). If neither of those methods is effective for your cluster, you can disable ACPI completely by appending acpi=off to the kernel boot command line in the grub.conf file.

Important

This method completely disables ACPI; some computers do not boot correctly if ACPI is completely disabled. Use this method only if the other methods are not effective for your cluster.
You can disable ACPI completely by editing the grub.conf file of each cluster node as follows:
  1. Open /boot/grub/grub.conf with a text editor.
  2. Append acpi=off to the kernel boot command line in /boot/grub/grub.conf (refer to Example 2.2, “Kernel Boot Command Line with acpi=off Appended to It”).
  3. Reboot the node.
  4. When the cluster is configured and running, verify that the node turns off immediately when fenced.

    Note

    You can fence the node with the fence_node command or Conga.
Example 2.2. Kernel Boot Command Line with acpi=off Appended to It
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/mapper/vg_doc01-lv_root 
#          initrd /initrd-[generic-]version.img
#boot=/dev/hda
default=0
timeout=5
serial --unit=0 --speed=115200
terminal --timeout=5 serial console
title Red Hat Enterprise Linux Server (2.6.32-193.el6.x86_64)
        root (hd0,0)
        kernel /vmlinuz-2.6.32-193.el6.x86_64 ro root=/dev/mapper/vg_doc01-lv_root console=ttyS0,115200n8 acpi=off
        initrd /initramrs-2.6.32-131.0.15.el6.x86_64.img
In this example, acpi=off has been appended to the kernel boot command line — the line starting with "kernel /vmlinuz-2.6.32-193.el6.x86_64.img".